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Finding the Fourth Proportional to 680,614,612.80, 1,020,921,919.20 and 665,498,068.80

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Solution

The fourth proportional to 680,614,612.80, 1,020,921,919.20 and 665,498,068.80 is: 998,247,103.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,614,612.80 : 1,020,921,919.20 = 665,498,068.80 : x
  2. Step 2: Convert to fraction form
    680,614,612.80/1,020,921,919.20 = 665,498,068.80/x
  3. Step 3: Cross multiply
    680,614,612.80x = 1,020,921,919.20 × 665,498,068.80
  4. Step 4: Simplify right side
    680,614,612.80x = 679,421,565,623,189,632
  5. Step 5: Solve for x
    x = 679,421,565,623,189,632/680,614,612.80
  6. Step 6: Final answer
    x = 998,247,103.20

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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.