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Finding the Fourth Proportional to 390,312.60, 538,617.60 and 220,543.08

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Solution

The fourth proportional to 390,312.60, 538,617.60 and 220,543.08 is: 304,341.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,312.60 : 538,617.60 = 220,543.08 : x
  2. Step 2: Convert to fraction form
    390,312.60/538,617.60 = 220,543.08/x
  3. Step 3: Cross multiply
    390,312.60x = 538,617.60 × 220,543.08
  4. Step 4: Simplify right side
    390,312.60x = 118,788,384,446.21
  5. Step 5: Solve for x
    x = 118,788,384,446.21/390,312.60
  6. Step 6: Final answer
    x = 304,341.66

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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.