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Finding the Fourth Proportional to 753.61, 1,130.40 and 320.47

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Solution

The fourth proportional to 753.61, 1,130.40 and 320.47 is: 480.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.61 : 1,130.40 = 320.47 : x
  2. Step 2: Convert to fraction form
    753.61/1,130.40 = 320.47/x
  3. Step 3: Cross multiply
    753.61x = 1,130.40 × 320.47
  4. Step 4: Simplify right side
    753.61x = 362,259.29
  5. Step 5: Solve for x
    x = 362,259.29/753.61
  6. Step 6: Final answer
    x = 480.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.