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Finding the Fourth Proportional to 387,607.20, 534,903.12 and 217,831.20

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Solution

The fourth proportional to 387,607.20, 534,903.12 and 217,831.20 is: 300,609.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,607.20 : 534,903.12 = 217,831.20 : x
  2. Step 2: Convert to fraction form
    387,607.20/534,903.12 = 217,831.20/x
  3. Step 3: Cross multiply
    387,607.20x = 534,903.12 × 217,831.20
  4. Step 4: Simplify right side
    387,607.20x = 116,518,588,513.34
  5. Step 5: Solve for x
    x = 116,518,588,513.34/387,607.20
  6. Step 6: Final answer
    x = 300,609.97

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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.