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Finding the Fourth Proportional to 522,091.70, 783,137.55 and 312,139.70

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Solution

The fourth proportional to 522,091.70, 783,137.55 and 312,139.70 is: 468,209.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    522,091.70 : 783,137.55 = 312,139.70 : x
  2. Step 2: Convert to fraction form
    522,091.70/783,137.55 = 312,139.70/x
  3. Step 3: Cross multiply
    522,091.70x = 783,137.55 × 312,139.70
  4. Step 4: Simplify right side
    522,091.70x = 244,448,319,915.74
  5. Step 5: Solve for x
    x = 244,448,319,915.74/522,091.70
  6. Step 6: Final answer
    x = 468,209.55

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.