Home / 612,748.90-918,139.20-402,140.80

Finding the Fourth Proportional to 612,748.90, 918,139.20 and 402,140.80

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Solution

The fourth proportional to 612,748.90, 918,139.20 and 402,140.80 is: 602,565.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,748.90 : 918,139.20 = 402,140.80 : x
  2. Step 2: Convert to fraction form
    612,748.90/918,139.20 = 402,140.80/x
  3. Step 3: Cross multiply
    612,748.90x = 918,139.20 × 402,140.80
  4. Step 4: Simplify right side
    612,748.90x = 369,221,232,399.36
  5. Step 5: Solve for x
    x = 369,221,232,399.36/612,748.90
  6. Step 6: Final answer
    x = 602,565.31

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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.