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Finding the Fourth Proportional to 784.32, 1,080.12 and 715.08

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Solution

The fourth proportional to 784.32, 1,080.12 and 715.08 is: 984.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.32 : 1,080.12 = 715.08 : x
  2. Step 2: Convert to fraction form
    784.32/1,080.12 = 715.08/x
  3. Step 3: Cross multiply
    784.32x = 1,080.12 × 715.08
  4. Step 4: Simplify right side
    784.32x = 772,372.21
  5. Step 5: Solve for x
    x = 772,372.21/784.32
  6. Step 6: Final answer
    x = 984.77

Related Problems

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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.