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Finding the Fourth Proportional to 145,239.76, 217,728.42 and 100,887.40

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Solution

The fourth proportional to 145,239.76, 217,728.42 and 100,887.40 is: 151,239.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,239.76 : 217,728.42 = 100,887.40 : x
  2. Step 2: Convert to fraction form
    145,239.76/217,728.42 = 100,887.40/x
  3. Step 3: Cross multiply
    145,239.76x = 217,728.42 × 100,887.40
  4. Step 4: Simplify right side
    145,239.76x = 21,966,054,199.91
  5. Step 5: Solve for x
    x = 21,966,054,199.91/145,239.76
  6. Step 6: Final answer
    x = 151,239.95

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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.