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Finding the Fourth Proportional to 938.16, 1,407.24 and 390.18

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Solution

The fourth proportional to 938.16, 1,407.24 and 390.18 is: 585.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.16 : 1,407.24 = 390.18 : x
  2. Step 2: Convert to fraction form
    938.16/1,407.24 = 390.18/x
  3. Step 3: Cross multiply
    938.16x = 1,407.24 × 390.18
  4. Step 4: Simplify right side
    938.16x = 549,076.90
  5. Step 5: Solve for x
    x = 549,076.90/938.16
  6. Step 6: Final answer
    x = 585.27

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Double scale
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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.