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Finding the Fourth Proportional to 72,428.80, 108,643.20 and 42,831.40

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Solution

The fourth proportional to 72,428.80, 108,643.20 and 42,831.40 is: 64,247.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,428.80 : 108,643.20 = 42,831.40 : x
  2. Step 2: Convert to fraction form
    72,428.80/108,643.20 = 42,831.40/x
  3. Step 3: Cross multiply
    72,428.80x = 108,643.20 × 42,831.40
  4. Step 4: Simplify right side
    72,428.80x = 4,653,340,356.48
  5. Step 5: Solve for x
    x = 4,653,340,356.48/72,428.80
  6. Step 6: Final answer
    x = 64,247.10

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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.