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Finding the Fourth Proportional to 710,927.96, 981,078.36 and 388,638.32

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Solution

The fourth proportional to 710,927.96, 981,078.36 and 388,638.32 is: 536,319.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    710,927.96 : 981,078.36 = 388,638.32 : x
  2. Step 2: Convert to fraction form
    710,927.96/981,078.36 = 388,638.32/x
  3. Step 3: Cross multiply
    710,927.96x = 981,078.36 × 388,638.32
  4. Step 4: Simplify right side
    710,927.96x = 381,284,645,618.76
  5. Step 5: Solve for x
    x = 381,284,645,618.76/710,927.96
  6. Step 6: Final answer
    x = 536,319.67

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.