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Finding the Fourth Proportional to 985.47, 1,359.53 and 690.93

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Solution

The fourth proportional to 985.47, 1,359.53 and 690.93 is: 953.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.47 : 1,359.53 = 690.93 : x
  2. Step 2: Convert to fraction form
    985.47/1,359.53 = 690.93/x
  3. Step 3: Cross multiply
    985.47x = 1,359.53 × 690.93
  4. Step 4: Simplify right side
    985.47x = 939,343.09
  5. Step 5: Solve for x
    x = 939,343.09/985.47
  6. Step 6: Final answer
    x = 953.20

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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.