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Finding the Fourth Proportional to 390,389.53, 538,677.97 and 220,561.69

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Solution

The fourth proportional to 390,389.53, 538,677.97 and 220,561.69 is: 304,341.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,389.53 : 538,677.97 = 220,561.69 : x
  2. Step 2: Convert to fraction form
    390,389.53/538,677.97 = 220,561.69/x
  3. Step 3: Cross multiply
    390,389.53x = 538,677.97 × 220,561.69
  4. Step 4: Simplify right side
    390,389.53x = 118,811,723,428.97
  5. Step 5: Solve for x
    x = 118,811,723,428.97/390,389.53
  6. Step 6: Final answer
    x = 304,341.47

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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.