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Finding the Fourth Proportional to 636,923.90, 879,347.70 and 438,355.28

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Solution

The fourth proportional to 636,923.90, 879,347.70 and 438,355.28 is: 605,200.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,923.90 : 879,347.70 = 438,355.28 : x
  2. Step 2: Convert to fraction form
    636,923.90/879,347.70 = 438,355.28/x
  3. Step 3: Cross multiply
    636,923.90x = 879,347.70 × 438,355.28
  4. Step 4: Simplify right side
    636,923.90x = 385,466,707,250.86
  5. Step 5: Solve for x
    x = 385,466,707,250.86/636,923.90
  6. Step 6: Final answer
    x = 605,200.57

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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.