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Finding the Fourth Proportional to 261,618.30, 392,427.45 and 128,583.90

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Solution

The fourth proportional to 261,618.30, 392,427.45 and 128,583.90 is: 192,875.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,618.30 : 392,427.45 = 128,583.90 : x
  2. Step 2: Convert to fraction form
    261,618.30/392,427.45 = 128,583.90/x
  3. Step 3: Cross multiply
    261,618.30x = 392,427.45 × 128,583.90
  4. Step 4: Simplify right side
    261,618.30x = 50,459,851,988.06
  5. Step 5: Solve for x
    x = 50,459,851,988.06/261,618.30
  6. Step 6: Final answer
    x = 192,875.85

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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.