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Finding the Fourth Proportional to 776.60, 1,071.80 and 445.13

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Solution

The fourth proportional to 776.60, 1,071.80 and 445.13 is: 614.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.60 : 1,071.80 = 445.13 : x
  2. Step 2: Convert to fraction form
    776.60/1,071.80 = 445.13/x
  3. Step 3: Cross multiply
    776.60x = 1,071.80 × 445.13
  4. Step 4: Simplify right side
    776.60x = 477,088.11
  5. Step 5: Solve for x
    x = 477,088.11/776.60
  6. Step 6: Final answer
    x = 614.33

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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.