Home / 1,143.10-1,570.55-921.36

Finding the Fourth Proportional to 1,143.10, 1,570.55 and 921.36

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Solution

The fourth proportional to 1,143.10, 1,570.55 and 921.36 is: 1,265.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.10 : 1,570.55 = 921.36 : x
  2. Step 2: Convert to fraction form
    1,143.10/1,570.55 = 921.36/x
  3. Step 3: Cross multiply
    1,143.10x = 1,570.55 × 921.36
  4. Step 4: Simplify right side
    1,143.10x = 1,447,041.95
  5. Step 5: Solve for x
    x = 1,447,041.95/1,143.10
  6. Step 6: Final answer
    x = 1,265.89

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.