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Finding the Fourth Proportional to 261,578.70, 392,659.65 and 143,480.70

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Solution

The fourth proportional to 261,578.70, 392,659.65 and 143,480.70 is: 215,381.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,578.70 : 392,659.65 = 143,480.70 : x
  2. Step 2: Convert to fraction form
    261,578.70/392,659.65 = 143,480.70/x
  3. Step 3: Cross multiply
    261,578.70x = 392,659.65 × 143,480.70
  4. Step 4: Simplify right side
    261,578.70x = 56,339,081,443.76
  5. Step 5: Solve for x
    x = 56,339,081,443.76/261,578.70
  6. Step 6: Final answer
    x = 215,381.00

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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.