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Finding the Fourth Proportional to 915.32, 1,263.05 and 620.70

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Solution

The fourth proportional to 915.32, 1,263.05 and 620.70 is: 856.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.32 : 1,263.05 = 620.70 : x
  2. Step 2: Convert to fraction form
    915.32/1,263.05 = 620.70/x
  3. Step 3: Cross multiply
    915.32x = 1,263.05 × 620.70
  4. Step 4: Simplify right side
    915.32x = 783,975.14
  5. Step 5: Solve for x
    x = 783,975.14/915.32
  6. Step 6: Final answer
    x = 856.50

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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.