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Finding the Fourth Proportional to 261,660.40, 392,490.60 and 172,430.80

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Solution

The fourth proportional to 261,660.40, 392,490.60 and 172,430.80 is: 258,646.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,660.40 : 392,490.60 = 172,430.80 : x
  2. Step 2: Convert to fraction form
    261,660.40/392,490.60 = 172,430.80/x
  3. Step 3: Cross multiply
    261,660.40x = 392,490.60 × 172,430.80
  4. Step 4: Simplify right side
    261,660.40x = 67,677,468,150.48
  5. Step 5: Solve for x
    x = 67,677,468,150.48/261,660.40
  6. Step 6: Final answer
    x = 258,646.20

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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.