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Finding the Fourth Proportional to 1,130.25, 1,559.93 and 820.29

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Solution

The fourth proportional to 1,130.25, 1,559.93 and 820.29 is: 1,132.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.25 : 1,559.93 = 820.29 : x
  2. Step 2: Convert to fraction form
    1,130.25/1,559.93 = 820.29/x
  3. Step 3: Cross multiply
    1,130.25x = 1,559.93 × 820.29
  4. Step 4: Simplify right side
    1,130.25x = 1,279,590.88
  5. Step 5: Solve for x
    x = 1,279,590.88/1,130.25
  6. Step 6: Final answer
    x = 1,132.13

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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.