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Finding the Fourth Proportional to 1,070.79, 1,477.36 and 698.31

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Solution

The fourth proportional to 1,070.79, 1,477.36 and 698.31 is: 963.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.79 : 1,477.36 = 698.31 : x
  2. Step 2: Convert to fraction form
    1,070.79/1,477.36 = 698.31/x
  3. Step 3: Cross multiply
    1,070.79x = 1,477.36 × 698.31
  4. Step 4: Simplify right side
    1,070.79x = 1,031,655.26
  5. Step 5: Solve for x
    x = 1,031,655.26/1,070.79
  6. Step 6: Final answer
    x = 963.45

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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.