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Finding the Fourth Proportional to 660,223.80, 990,335.70 and 424,027.80

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Solution

The fourth proportional to 660,223.80, 990,335.70 and 424,027.80 is: 636,041.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,223.80 : 990,335.70 = 424,027.80 : x
  2. Step 2: Convert to fraction form
    660,223.80/990,335.70 = 424,027.80/x
  3. Step 3: Cross multiply
    660,223.80x = 990,335.70 × 424,027.80
  4. Step 4: Simplify right side
    660,223.80x = 419,929,868,132.46
  5. Step 5: Solve for x
    x = 419,929,868,132.46/660,223.80
  6. Step 6: Final answer
    x = 636,041.70

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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.