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Finding the Fourth Proportional to 84,985.20, 127,477.80 and 75,143.70

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Solution

The fourth proportional to 84,985.20, 127,477.80 and 75,143.70 is: 112,715.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,985.20 : 127,477.80 = 75,143.70 : x
  2. Step 2: Convert to fraction form
    84,985.20/127,477.80 = 75,143.70/x
  3. Step 3: Cross multiply
    84,985.20x = 127,477.80 × 75,143.70
  4. Step 4: Simplify right side
    84,985.20x = 9,579,153,559.86
  5. Step 5: Solve for x
    x = 9,579,153,559.86/84,985.20
  6. Step 6: Final answer
    x = 112,715.55

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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.