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Finding the Fourth Proportional to 542,406.20, 812,831.70 and 399,133.40

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Solution

The fourth proportional to 542,406.20, 812,831.70 and 399,133.40 is: 598,127.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    542,406.20 : 812,831.70 = 399,133.40 : x
  2. Step 2: Convert to fraction form
    542,406.20/812,831.70 = 399,133.40/x
  3. Step 3: Cross multiply
    542,406.20x = 812,831.70 × 399,133.40
  4. Step 4: Simplify right side
    542,406.20x = 324,428,280,048.78
  5. Step 5: Solve for x
    x = 324,428,280,048.78/542,406.20
  6. Step 6: Final answer
    x = 598,127.90

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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.