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Finding the Fourth Proportional to 711.57, 981.91 and 412.76

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Solution

The fourth proportional to 711.57, 981.91 and 412.76 is: 569.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.57 : 981.91 = 412.76 : x
  2. Step 2: Convert to fraction form
    711.57/981.91 = 412.76/x
  3. Step 3: Cross multiply
    711.57x = 981.91 × 412.76
  4. Step 4: Simplify right side
    711.57x = 405,291.42
  5. Step 5: Solve for x
    x = 405,291.42/711.57
  6. Step 6: Final answer
    x = 569.57

Related Problems

Find fourth proportional to 355.79, 490.95 and 206.38
Half scale
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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.