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Finding the Fourth Proportional to 586.30, 809.58 and 390.70

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Solution

The fourth proportional to 586.30, 809.58 and 390.70 is: 539.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    586.30 : 809.58 = 390.70 : x
  2. Step 2: Convert to fraction form
    586.30/809.58 = 390.70/x
  3. Step 3: Cross multiply
    586.30x = 809.58 × 390.70
  4. Step 4: Simplify right side
    586.30x = 316,302.91
  5. Step 5: Solve for x
    x = 316,302.91/586.30
  6. Step 6: Final answer
    x = 539.49

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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.