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Finding the Fourth Proportional to 985.80, 1,360.59 and 612.93

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Solution

The fourth proportional to 985.80, 1,360.59 and 612.93 is: 845.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.80 : 1,360.59 = 612.93 : x
  2. Step 2: Convert to fraction form
    985.80/1,360.59 = 612.93/x
  3. Step 3: Cross multiply
    985.80x = 1,360.59 × 612.93
  4. Step 4: Simplify right side
    985.80x = 833,946.43
  5. Step 5: Solve for x
    x = 833,946.43/985.80
  6. Step 6: Final answer
    x = 845.96

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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.