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Finding the Fourth Proportional to 153,120.95, 229,712.08 and 85,748.79

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Solution

The fourth proportional to 153,120.95, 229,712.08 and 85,748.79 is: 128,640.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,120.95 : 229,712.08 = 85,748.79 : x
  2. Step 2: Convert to fraction form
    153,120.95/229,712.08 = 85,748.79/x
  3. Step 3: Cross multiply
    153,120.95x = 229,712.08 × 85,748.79
  4. Step 4: Simplify right side
    153,120.95x = 19,697,532,908.38
  5. Step 5: Solve for x
    x = 19,697,532,908.38/153,120.95
  6. Step 6: Final answer
    x = 128,640.35

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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.