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Finding the Fourth Proportional to 398,642.03, 550,130.33 and 217,352.51

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Solution

The fourth proportional to 398,642.03, 550,130.33 and 217,352.51 is: 299,948.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,642.03 : 550,130.33 = 217,352.51 : x
  2. Step 2: Convert to fraction form
    398,642.03/550,130.33 = 217,352.51/x
  3. Step 3: Cross multiply
    398,642.03x = 550,130.33 × 217,352.51
  4. Step 4: Simplify right side
    398,642.03x = 119,572,206,965.87
  5. Step 5: Solve for x
    x = 119,572,206,965.87/398,642.03
  6. Step 6: Final answer
    x = 299,948.82

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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.