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Finding the Fourth Proportional to 869.93, 1,200.71 and 558.89

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Solution

The fourth proportional to 869.93, 1,200.71 and 558.89 is: 771.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.93 : 1,200.71 = 558.89 : x
  2. Step 2: Convert to fraction form
    869.93/1,200.71 = 558.89/x
  3. Step 3: Cross multiply
    869.93x = 1,200.71 × 558.89
  4. Step 4: Simplify right side
    869.93x = 671,062.02
  5. Step 5: Solve for x
    x = 671,062.02/869.93
  6. Step 6: Final answer
    x = 771.40

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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.