Home / 1,020.60-1,407.51-739.80

Finding the Fourth Proportional to 1,020.60, 1,407.51 and 739.80

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Solution

The fourth proportional to 1,020.60, 1,407.51 and 739.80 is: 1,020.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.60 : 1,407.51 = 739.80 : x
  2. Step 2: Convert to fraction form
    1,020.60/1,407.51 = 739.80/x
  3. Step 3: Cross multiply
    1,020.60x = 1,407.51 × 739.80
  4. Step 4: Simplify right side
    1,020.60x = 1,041,275.90
  5. Step 5: Solve for x
    x = 1,041,275.90/1,020.60
  6. Step 6: Final answer
    x = 1,020.26

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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.