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Finding the Fourth Proportional to 390,758.64, 586,131.78 and 124,515.34

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Solution

The fourth proportional to 390,758.64, 586,131.78 and 124,515.34 is: 186,771.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,758.64 : 586,131.78 = 124,515.34 : x
  2. Step 2: Convert to fraction form
    390,758.64/586,131.78 = 124,515.34/x
  3. Step 3: Cross multiply
    390,758.64x = 586,131.78 × 124,515.34
  4. Step 4: Simplify right side
    390,758.64x = 72,982,397,871.51
  5. Step 5: Solve for x
    x = 72,982,397,871.51/390,758.64
  6. Step 6: Final answer
    x = 186,771.04

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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.