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Finding the Fourth Proportional to 572.51, 858.77 and 139.67

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Solution

The fourth proportional to 572.51, 858.77 and 139.67 is: 209.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.51 : 858.77 = 139.67 : x
  2. Step 2: Convert to fraction form
    572.51/858.77 = 139.67/x
  3. Step 3: Cross multiply
    572.51x = 858.77 × 139.67
  4. Step 4: Simplify right side
    572.51x = 119,939.41
  5. Step 5: Solve for x
    x = 119,939.41/572.51
  6. Step 6: Final answer
    x = 209.50

Related Problems

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Half scale
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Double scale
Find fourth proportional to 573.51, 860.27 and 140.67
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.