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Finding the Fourth Proportional to 261,215.20, 391,822.80 and 167,903.20

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Solution

The fourth proportional to 261,215.20, 391,822.80 and 167,903.20 is: 251,854.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,215.20 : 391,822.80 = 167,903.20 : x
  2. Step 2: Convert to fraction form
    261,215.20/391,822.80 = 167,903.20/x
  3. Step 3: Cross multiply
    261,215.20x = 391,822.80 × 167,903.20
  4. Step 4: Simplify right side
    261,215.20x = 65,788,301,952.96
  5. Step 5: Solve for x
    x = 65,788,301,952.96/261,215.20
  6. Step 6: Final answer
    x = 251,854.80

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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.