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Finding the Fourth Proportional to 904.28, 1,247.90 and 511.38

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Solution

The fourth proportional to 904.28, 1,247.90 and 511.38 is: 705.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.28 : 1,247.90 = 511.38 : x
  2. Step 2: Convert to fraction form
    904.28/1,247.90 = 511.38/x
  3. Step 3: Cross multiply
    904.28x = 1,247.90 × 511.38
  4. Step 4: Simplify right side
    904.28x = 638,151.10
  5. Step 5: Solve for x
    x = 638,151.10/904.28
  6. Step 6: Final answer
    x = 705.70

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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.