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Finding the Fourth Proportional to 718.01, 1,069.80 and 670.86

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Solution

The fourth proportional to 718.01, 1,069.80 and 670.86 is: 999.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.01 : 1,069.80 = 670.86 : x
  2. Step 2: Convert to fraction form
    718.01/1,069.80 = 670.86/x
  3. Step 3: Cross multiply
    718.01x = 1,069.80 × 670.86
  4. Step 4: Simplify right side
    718.01x = 717,683.51
  5. Step 5: Solve for x
    x = 717,683.51/718.01
  6. Step 6: Final answer
    x = 999.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.