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Finding the Fourth Proportional to 671,990.90, 1,007,986.35 and 620,669.30

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Solution

The fourth proportional to 671,990.90, 1,007,986.35 and 620,669.30 is: 931,003.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    671,990.90 : 1,007,986.35 = 620,669.30 : x
  2. Step 2: Convert to fraction form
    671,990.90/1,007,986.35 = 620,669.30/x
  3. Step 3: Cross multiply
    671,990.90x = 1,007,986.35 × 620,669.30
  4. Step 4: Simplify right side
    671,990.90x = 625,626,182,264.06
  5. Step 5: Solve for x
    x = 625,626,182,264.06/671,990.90
  6. Step 6: Final answer
    x = 931,003.95

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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.