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Finding the Fourth Proportional to 740.18, 1,021.80 and 520.29

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Solution

The fourth proportional to 740.18, 1,021.80 and 520.29 is: 718.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.18 : 1,021.80 = 520.29 : x
  2. Step 2: Convert to fraction form
    740.18/1,021.80 = 520.29/x
  3. Step 3: Cross multiply
    740.18x = 1,021.80 × 520.29
  4. Step 4: Simplify right side
    740.18x = 531,632.32
  5. Step 5: Solve for x
    x = 531,632.32/740.18
  6. Step 6: Final answer
    x = 718.25

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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.