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Finding the Fourth Proportional to 720,661.80, 994,793.70 and 645,079.08

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Solution

The fourth proportional to 720,661.80, 994,793.70 and 645,079.08 is: 890,460.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,661.80 : 994,793.70 = 645,079.08 : x
  2. Step 2: Convert to fraction form
    720,661.80/994,793.70 = 645,079.08/x
  3. Step 3: Cross multiply
    720,661.80x = 994,793.70 × 645,079.08
  4. Step 4: Simplify right side
    720,661.80x = 641,720,604,785.80
  5. Step 5: Solve for x
    x = 641,720,604,785.80/720,661.80
  6. Step 6: Final answer
    x = 890,460.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.