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Finding the Fourth Proportional to 261,630.10, 392,445.15 and 259,661.80

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Solution

The fourth proportional to 261,630.10, 392,445.15 and 259,661.80 is: 389,492.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,630.10 : 392,445.15 = 259,661.80 : x
  2. Step 2: Convert to fraction form
    261,630.10/392,445.15 = 259,661.80/x
  3. Step 3: Cross multiply
    261,630.10x = 392,445.15 × 259,661.80
  4. Step 4: Simplify right side
    261,630.10x = 101,903,014,050.27
  5. Step 5: Solve for x
    x = 101,903,014,050.27/261,630.10
  6. Step 6: Final answer
    x = 389,492.70

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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.