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Finding the Fourth Proportional to 391,541.80, 587,312.70 and 343,330.60

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Solution

The fourth proportional to 391,541.80, 587,312.70 and 343,330.60 is: 514,995.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,541.80 : 587,312.70 = 343,330.60 : x
  2. Step 2: Convert to fraction form
    391,541.80/587,312.70 = 343,330.60/x
  3. Step 3: Cross multiply
    391,541.80x = 587,312.70 × 343,330.60
  4. Step 4: Simplify right side
    391,541.80x = 201,642,421,678.62
  5. Step 5: Solve for x
    x = 201,642,421,678.62/391,541.80
  6. Step 6: Final answer
    x = 514,995.90

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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.