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Finding the Fourth Proportional to 261,420.80, 392,390.40 and 128,451.20

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Solution

The fourth proportional to 261,420.80, 392,390.40 and 128,451.20 is: 192,804.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,420.80 : 392,390.40 = 128,451.20 : x
  2. Step 2: Convert to fraction form
    261,420.80/392,390.40 = 128,451.20/x
  3. Step 3: Cross multiply
    261,420.80x = 392,390.40 × 128,451.20
  4. Step 4: Simplify right side
    261,420.80x = 50,403,017,748.48
  5. Step 5: Solve for x
    x = 50,403,017,748.48/261,420.80
  6. Step 6: Final answer
    x = 192,804.16

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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.