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Finding the Fourth Proportional to 710.30, 980.30 and 687.62

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Solution

The fourth proportional to 710.30, 980.30 and 687.62 is: 948.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.30 : 980.30 = 687.62 : x
  2. Step 2: Convert to fraction form
    710.30/980.30 = 687.62/x
  3. Step 3: Cross multiply
    710.30x = 980.30 × 687.62
  4. Step 4: Simplify right side
    710.30x = 674,070.45
  5. Step 5: Solve for x
    x = 674,070.45/710.30
  6. Step 6: Final answer
    x = 948.99

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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.