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Finding the Fourth Proportional to 819,521.80, 1,230,281.10 and 520,001.80

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Solution

The fourth proportional to 819,521.80, 1,230,281.10 and 520,001.80 is: 780,636.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    819,521.80 : 1,230,281.10 = 520,001.80 : x
  2. Step 2: Convert to fraction form
    819,521.80/1,230,281.10 = 520,001.80/x
  3. Step 3: Cross multiply
    819,521.80x = 1,230,281.10 × 520,001.80
  4. Step 4: Simplify right side
    819,521.80x = 639,748,386,505.98
  5. Step 5: Solve for x
    x = 639,748,386,505.98/819,521.80
  6. Step 6: Final answer
    x = 780,636.20

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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.