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Finding the Fourth Proportional to 586.87, 810.56 and 390.04

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Solution

The fourth proportional to 586.87, 810.56 and 390.04 is: 538.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    586.87 : 810.56 = 390.04 : x
  2. Step 2: Convert to fraction form
    586.87/810.56 = 390.04/x
  3. Step 3: Cross multiply
    586.87x = 810.56 × 390.04
  4. Step 4: Simplify right side
    586.87x = 316,150.82
  5. Step 5: Solve for x
    x = 316,150.82/586.87
  6. Step 6: Final answer
    x = 538.71

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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.