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Finding the Fourth Proportional to 675,257.40, 931,956.30 and 420,690.60

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Solution

The fourth proportional to 675,257.40, 931,956.30 and 420,690.60 is: 580,616.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    675,257.40 : 931,956.30 = 420,690.60 : x
  2. Step 2: Convert to fraction form
    675,257.40/931,956.30 = 420,690.60/x
  3. Step 3: Cross multiply
    675,257.40x = 931,956.30 × 420,690.60
  4. Step 4: Simplify right side
    675,257.40x = 392,065,255,020.78
  5. Step 5: Solve for x
    x = 392,065,255,020.78/675,257.40
  6. Step 6: Final answer
    x = 580,616.01

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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.