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Finding the Fourth Proportional to 738,398.50, 1,018,990.50 and 398,866.78

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Solution

The fourth proportional to 738,398.50, 1,018,990.50 and 398,866.78 is: 550,436.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    738,398.50 : 1,018,990.50 = 398,866.78 : x
  2. Step 2: Convert to fraction form
    738,398.50/1,018,990.50 = 398,866.78/x
  3. Step 3: Cross multiply
    738,398.50x = 1,018,990.50 × 398,866.78
  4. Step 4: Simplify right side
    738,398.50x = 406,441,459,585.59
  5. Step 5: Solve for x
    x = 406,441,459,585.59/738,398.50
  6. Step 6: Final answer
    x = 550,436.46

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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.