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Finding the Fourth Proportional to 1,056.48, 1,585.17 and 407.67

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Solution

The fourth proportional to 1,056.48, 1,585.17 and 407.67 is: 611.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,056.48 : 1,585.17 = 407.67 : x
  2. Step 2: Convert to fraction form
    1,056.48/1,585.17 = 407.67/x
  3. Step 3: Cross multiply
    1,056.48x = 1,585.17 × 407.67
  4. Step 4: Simplify right side
    1,056.48x = 646,220.31
  5. Step 5: Solve for x
    x = 646,220.31/1,056.48
  6. Step 6: Final answer
    x = 611.68

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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.