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Finding the Fourth Proportional to 877.02, 1,312.28 and 721.50

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Solution

The fourth proportional to 877.02, 1,312.28 and 721.50 is: 1,079.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.02 : 1,312.28 = 721.50 : x
  2. Step 2: Convert to fraction form
    877.02/1,312.28 = 721.50/x
  3. Step 3: Cross multiply
    877.02x = 1,312.28 × 721.50
  4. Step 4: Simplify right side
    877.02x = 946,803.46
  5. Step 5: Solve for x
    x = 946,803.46/877.02
  6. Step 6: Final answer
    x = 1,079.57

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1.5x scale

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.