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Finding the Fourth Proportional to 620,868.80, 931,432.80 and 354,411.20

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Solution

The fourth proportional to 620,868.80, 931,432.80 and 354,411.20 is: 531,690.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,868.80 : 931,432.80 = 354,411.20 : x
  2. Step 2: Convert to fraction form
    620,868.80/931,432.80 = 354,411.20/x
  3. Step 3: Cross multiply
    620,868.80x = 931,432.80 × 354,411.20
  4. Step 4: Simplify right side
    620,868.80x = 330,110,216,367.36
  5. Step 5: Solve for x
    x = 330,110,216,367.36/620,868.80
  6. Step 6: Final answer
    x = 531,690.78

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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.