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Finding the Fourth Proportional to 738,352.15, 1,018,926 and 398,820.40

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Solution

The fourth proportional to 738,352.15, 1,018,926 and 398,820.40 is: 550,372.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    738,352.15 : 1,018,926 = 398,820.40 : x
  2. Step 2: Convert to fraction form
    738,352.15/1,018,926 = 398,820.40/x
  3. Step 3: Cross multiply
    738,352.15x = 1,018,926 × 398,820.40
  4. Step 4: Simplify right side
    738,352.15x = 406,368,472,343.09
  5. Step 5: Solve for x
    x = 406,368,472,343.09/738,352.15
  6. Step 6: Final answer
    x = 550,372.17

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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.