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Finding the Fourth Proportional to 870.77, 1,200.87 and 571.74

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Solution

The fourth proportional to 870.77, 1,200.87 and 571.74 is: 788.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.77 : 1,200.87 = 571.74 : x
  2. Step 2: Convert to fraction form
    870.77/1,200.87 = 571.74/x
  3. Step 3: Cross multiply
    870.77x = 1,200.87 × 571.74
  4. Step 4: Simplify right side
    870.77x = 686,585.41
  5. Step 5: Solve for x
    x = 686,585.41/870.77
  6. Step 6: Final answer
    x = 788.49

Related Problems

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Double scale
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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.