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Finding the Fourth Proportional to 390,968.64, 586,165.92 and 124,575.84

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Solution

The fourth proportional to 390,968.64, 586,165.92 and 124,575.84 is: 186,772.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,968.64 : 586,165.92 = 124,575.84 : x
  2. Step 2: Convert to fraction form
    390,968.64/586,165.92 = 124,575.84/x
  3. Step 3: Cross multiply
    390,968.64x = 586,165.92 × 124,575.84
  4. Step 4: Simplify right side
    390,968.64x = 73,022,111,863.37
  5. Step 5: Solve for x
    x = 73,022,111,863.37/390,968.64
  6. Step 6: Final answer
    x = 186,772.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.