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Finding the Fourth Proportional to 784.16, 1,080.74 and 693.66

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Solution

The fourth proportional to 784.16, 1,080.74 and 693.66 is: 956.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.16 : 1,080.74 = 693.66 : x
  2. Step 2: Convert to fraction form
    784.16/1,080.74 = 693.66/x
  3. Step 3: Cross multiply
    784.16x = 1,080.74 × 693.66
  4. Step 4: Simplify right side
    784.16x = 749,666.11
  5. Step 5: Solve for x
    x = 749,666.11/784.16
  6. Step 6: Final answer
    x = 956.01

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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.