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Finding the Fourth Proportional to 398,440.71, 550,386.65 and 318,429.03

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Solution

The fourth proportional to 398,440.71, 550,386.65 and 318,429.03 is: 439,862.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,440.71 : 550,386.65 = 318,429.03 : x
  2. Step 2: Convert to fraction form
    398,440.71/550,386.65 = 318,429.03/x
  3. Step 3: Cross multiply
    398,440.71x = 550,386.65 × 318,429.03
  4. Step 4: Simplify right side
    398,440.71x = 175,259,085,492.30
  5. Step 5: Solve for x
    x = 175,259,085,492.30/398,440.71
  6. Step 6: Final answer
    x = 439,862.40

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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.