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Finding the Fourth Proportional to 390,130.64, 538,424.06 and 220,375.72

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Solution

The fourth proportional to 390,130.64, 538,424.06 and 220,375.72 is: 304,143.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,130.64 : 538,424.06 = 220,375.72 : x
  2. Step 2: Convert to fraction form
    390,130.64/538,424.06 = 220,375.72/x
  3. Step 3: Cross multiply
    390,130.64x = 538,424.06 × 220,375.72
  4. Step 4: Simplify right side
    390,130.64x = 118,655,589,887.82
  5. Step 5: Solve for x
    x = 118,655,589,887.82/390,130.64
  6. Step 6: Final answer
    x = 304,143.22

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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.