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Finding the Fourth Proportional to 740.91, 1,019.50 and 718.37

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Solution

The fourth proportional to 740.91, 1,019.50 and 718.37 is: 988.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.91 : 1,019.50 = 718.37 : x
  2. Step 2: Convert to fraction form
    740.91/1,019.50 = 718.37/x
  3. Step 3: Cross multiply
    740.91x = 1,019.50 × 718.37
  4. Step 4: Simplify right side
    740.91x = 732,373.12
  5. Step 5: Solve for x
    x = 732,373.12/740.91
  6. Step 6: Final answer
    x = 988.48

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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.