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Finding the Fourth Proportional to 443,501.40, 665,252.10 and 391,013.40

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Solution

The fourth proportional to 443,501.40, 665,252.10 and 391,013.40 is: 586,520.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,501.40 : 665,252.10 = 391,013.40 : x
  2. Step 2: Convert to fraction form
    443,501.40/665,252.10 = 391,013.40/x
  3. Step 3: Cross multiply
    443,501.40x = 665,252.10 × 391,013.40
  4. Step 4: Simplify right side
    443,501.40x = 260,122,485,478.14
  5. Step 5: Solve for x
    x = 260,122,485,478.14/443,501.40
  6. Step 6: Final answer
    x = 586,520.10

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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.