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Finding the Fourth Proportional to 261,511.40, 392,072.70 and 143,316.20

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Solution

The fourth proportional to 261,511.40, 392,072.70 and 143,316.20 is: 214,867.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,511.40 : 392,072.70 = 143,316.20 : x
  2. Step 2: Convert to fraction form
    261,511.40/392,072.70 = 143,316.20/x
  3. Step 3: Cross multiply
    261,511.40x = 392,072.70 × 143,316.20
  4. Step 4: Simplify right side
    261,511.40x = 56,190,369,487.74
  5. Step 5: Solve for x
    x = 56,190,369,487.74/261,511.40
  6. Step 6: Final answer
    x = 214,867.76

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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.