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Finding the Fourth Proportional to 985.02, 1,474.65 and 777.66

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Solution

The fourth proportional to 985.02, 1,474.65 and 777.66 is: 1,164.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.02 : 1,474.65 = 777.66 : x
  2. Step 2: Convert to fraction form
    985.02/1,474.65 = 777.66/x
  3. Step 3: Cross multiply
    985.02x = 1,474.65 × 777.66
  4. Step 4: Simplify right side
    985.02x = 1,146,776.32
  5. Step 5: Solve for x
    x = 1,146,776.32/985.02
  6. Step 6: Final answer
    x = 1,164.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.