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Finding the Fourth Proportional to 710,205.72, 980,078.06 and 387,916.04

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Solution

The fourth proportional to 710,205.72, 980,078.06 and 387,916.04 is: 535,320.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    710,205.72 : 980,078.06 = 387,916.04 : x
  2. Step 2: Convert to fraction form
    710,205.72/980,078.06 = 387,916.04/x
  3. Step 3: Cross multiply
    710,205.72x = 980,078.06 × 387,916.04
  4. Step 4: Simplify right side
    710,205.72x = 380,187,993,086.11
  5. Step 5: Solve for x
    x = 380,187,993,086.11/710,205.72
  6. Step 6: Final answer
    x = 535,320.94

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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.