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Finding the Fourth Proportional to 1,036.32, 1,430.64 and 725.28

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Solution

The fourth proportional to 1,036.32, 1,430.64 and 725.28 is: 1,001.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.32 : 1,430.64 = 725.28 : x
  2. Step 2: Convert to fraction form
    1,036.32/1,430.64 = 725.28/x
  3. Step 3: Cross multiply
    1,036.32x = 1,430.64 × 725.28
  4. Step 4: Simplify right side
    1,036.32x = 1,037,614.58
  5. Step 5: Solve for x
    x = 1,037,614.58/1,036.32
  6. Step 6: Final answer
    x = 1,001.25

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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.