Home / 129,023.12-178,070.28-72,438.32

Finding the Fourth Proportional to 129,023.12, 178,070.28 and 72,438.32

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Solution

The fourth proportional to 129,023.12, 178,070.28 and 72,438.32 is: 99,975.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,023.12 : 178,070.28 = 72,438.32 : x
  2. Step 2: Convert to fraction form
    129,023.12/178,070.28 = 72,438.32/x
  3. Step 3: Cross multiply
    129,023.12x = 178,070.28 × 72,438.32
  4. Step 4: Simplify right side
    129,023.12x = 12,899,111,925.13
  5. Step 5: Solve for x
    x = 12,899,111,925.13/129,023.12
  6. Step 6: Final answer
    x = 99,975.20

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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.