Home / 1,020.16-1,407.80-578.20

Finding the Fourth Proportional to 1,020.16, 1,407.80 and 578.20

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Solution

The fourth proportional to 1,020.16, 1,407.80 and 578.20 is: 797.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.16 : 1,407.80 = 578.20 : x
  2. Step 2: Convert to fraction form
    1,020.16/1,407.80 = 578.20/x
  3. Step 3: Cross multiply
    1,020.16x = 1,407.80 × 578.20
  4. Step 4: Simplify right side
    1,020.16x = 813,989.96
  5. Step 5: Solve for x
    x = 813,989.96/1,020.16
  6. Step 6: Final answer
    x = 797.90

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1.5x scale

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.