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Finding the Fourth Proportional to 931.65, 1,285.40 and 538.62

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Solution

The fourth proportional to 931.65, 1,285.40 and 538.62 is: 743.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.65 : 1,285.40 = 538.62 : x
  2. Step 2: Convert to fraction form
    931.65/1,285.40 = 538.62/x
  3. Step 3: Cross multiply
    931.65x = 1,285.40 × 538.62
  4. Step 4: Simplify right side
    931.65x = 692,339.45
  5. Step 5: Solve for x
    x = 692,339.45/931.65
  6. Step 6: Final answer
    x = 743.13

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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.