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Finding the Fourth Proportional to 142,399.60, 213,307.80 and 72,318.40

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Solution

The fourth proportional to 142,399.60, 213,307.80 and 72,318.40 is: 108,329.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,399.60 : 213,307.80 = 72,318.40 : x
  2. Step 2: Convert to fraction form
    142,399.60/213,307.80 = 72,318.40/x
  3. Step 3: Cross multiply
    142,399.60x = 213,307.80 × 72,318.40
  4. Step 4: Simplify right side
    142,399.60x = 15,426,078,803.52
  5. Step 5: Solve for x
    x = 15,426,078,803.52/142,399.60
  6. Step 6: Final answer
    x = 108,329.51

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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.