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Finding the Fourth Proportional to 1,170.45, 1,615.19 and 646.50

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Solution

The fourth proportional to 1,170.45, 1,615.19 and 646.50 is: 892.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.45 : 1,615.19 = 646.50 : x
  2. Step 2: Convert to fraction form
    1,170.45/1,615.19 = 646.50/x
  3. Step 3: Cross multiply
    1,170.45x = 1,615.19 × 646.50
  4. Step 4: Simplify right side
    1,170.45x = 1,044,217.10
  5. Step 5: Solve for x
    x = 1,044,217.10/1,170.45
  6. Step 6: Final answer
    x = 892.15

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Double scale
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1.5x scale

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.