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Finding the Fourth Proportional to 129,455.80, 178,642.30 and 72,870.80

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Solution

The fourth proportional to 129,455.80, 178,642.30 and 72,870.80 is: 100,557.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,455.80 : 178,642.30 = 72,870.80 : x
  2. Step 2: Convert to fraction form
    129,455.80/178,642.30 = 72,870.80/x
  3. Step 3: Cross multiply
    129,455.80x = 178,642.30 × 72,870.80
  4. Step 4: Simplify right side
    129,455.80x = 13,017,807,314.84
  5. Step 5: Solve for x
    x = 13,017,807,314.84/129,455.80
  6. Step 6: Final answer
    x = 100,557.93

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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.