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Finding the Fourth Proportional to 84,865.59, 127,312.15 and 28,709.11

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Solution

The fourth proportional to 84,865.59, 127,312.15 and 28,709.11 is: 43,068.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,865.59 : 127,312.15 = 28,709.11 : x
  2. Step 2: Convert to fraction form
    84,865.59/127,312.15 = 28,709.11/x
  3. Step 3: Cross multiply
    84,865.59x = 127,312.15 × 28,709.11
  4. Step 4: Simplify right side
    84,865.59x = 3,655,018,518.69
  5. Step 5: Solve for x
    x = 3,655,018,518.69/84,865.59
  6. Step 6: Final answer
    x = 43,068.32

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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.