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Finding the Fourth Proportional to 1,170.35, 1,615.19 and 646.48

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Solution

The fourth proportional to 1,170.35, 1,615.19 and 646.48 is: 892.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.35 : 1,615.19 = 646.48 : x
  2. Step 2: Convert to fraction form
    1,170.35/1,615.19 = 646.48/x
  3. Step 3: Cross multiply
    1,170.35x = 1,615.19 × 646.48
  4. Step 4: Simplify right side
    1,170.35x = 1,044,193.18
  5. Step 5: Solve for x
    x = 1,044,193.18/1,170.35
  6. Step 6: Final answer
    x = 892.20

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Half scale
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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.