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Finding the Fourth Proportional to 661,321.20, 991,981.80 and 345,874.80

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Solution

The fourth proportional to 661,321.20, 991,981.80 and 345,874.80 is: 518,812.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,321.20 : 991,981.80 = 345,874.80 : x
  2. Step 2: Convert to fraction form
    661,321.20/991,981.80 = 345,874.80/x
  3. Step 3: Cross multiply
    661,321.20x = 991,981.80 × 345,874.80
  4. Step 4: Simplify right side
    661,321.20x = 343,101,506,678.64
  5. Step 5: Solve for x
    x = 343,101,506,678.64/661,321.20
  6. Step 6: Final answer
    x = 518,812.20

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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.