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Finding the Fourth Proportional to 985.59, 1,359.54 and 612.90

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Solution

The fourth proportional to 985.59, 1,359.54 and 612.90 is: 845.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.59 : 1,359.54 = 612.90 : x
  2. Step 2: Convert to fraction form
    985.59/1,359.54 = 612.90/x
  3. Step 3: Cross multiply
    985.59x = 1,359.54 × 612.90
  4. Step 4: Simplify right side
    985.59x = 833,262.07
  5. Step 5: Solve for x
    x = 833,262.07/985.59
  6. Step 6: Final answer
    x = 845.44

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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.