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Finding the Fourth Proportional to 390,145.60, 538,434.08 and 220,410.88

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Solution

The fourth proportional to 390,145.60, 538,434.08 and 220,410.88 is: 304,185.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,145.60 : 538,434.08 = 220,410.88 : x
  2. Step 2: Convert to fraction form
    390,145.60/538,434.08 = 220,410.88/x
  3. Step 3: Cross multiply
    390,145.60x = 538,434.08 × 220,410.88
  4. Step 4: Simplify right side
    390,145.60x = 118,676,729,394.79
  5. Step 5: Solve for x
    x = 118,676,729,394.79/390,145.60
  6. Step 6: Final answer
    x = 304,185.74

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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.