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Finding the Fourth Proportional to 1,160, 1,740 and 390.50

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Solution

The fourth proportional to 1,160, 1,740 and 390.50 is: 585.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,160 : 1,740 = 390.50 : x
  2. Step 2: Convert to fraction form
    1,160/1,740 = 390.50/x
  3. Step 3: Cross multiply
    1,160x = 1,740 × 390.50
  4. Step 4: Simplify right side
    1,160x = 679,470
  5. Step 5: Solve for x
    x = 679,470/1,160
  6. Step 6: Final answer
    x = 585.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.