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Finding the Fourth Proportional to 1,118.40, 1,543.58 and 621.20

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Solution

The fourth proportional to 1,118.40, 1,543.58 and 621.20 is: 857.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.40 : 1,543.58 = 621.20 : x
  2. Step 2: Convert to fraction form
    1,118.40/1,543.58 = 621.20/x
  3. Step 3: Cross multiply
    1,118.40x = 1,543.58 × 621.20
  4. Step 4: Simplify right side
    1,118.40x = 958,871.90
  5. Step 5: Solve for x
    x = 958,871.90/1,118.40
  6. Step 6: Final answer
    x = 857.36

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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.