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Finding the Fourth Proportional to 929.30, 1,275.09 and 875.30

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Solution

The fourth proportional to 929.30, 1,275.09 and 875.30 is: 1,200.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.30 : 1,275.09 = 875.30 : x
  2. Step 2: Convert to fraction form
    929.30/1,275.09 = 875.30/x
  3. Step 3: Cross multiply
    929.30x = 1,275.09 × 875.30
  4. Step 4: Simplify right side
    929.30x = 1,116,081.90
  5. Step 5: Solve for x
    x = 1,116,081.90/929.30
  6. Step 6: Final answer
    x = 1,200.99

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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.