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Finding the Fourth Proportional to 711.02, 981.30 and 490.10

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Solution

The fourth proportional to 711.02, 981.30 and 490.10 is: 676.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.02 : 981.30 = 490.10 : x
  2. Step 2: Convert to fraction form
    711.02/981.30 = 490.10/x
  3. Step 3: Cross multiply
    711.02x = 981.30 × 490.10
  4. Step 4: Simplify right side
    711.02x = 480,935.13
  5. Step 5: Solve for x
    x = 480,935.13/711.02
  6. Step 6: Final answer
    x = 676.40

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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.