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Finding the Fourth Proportional to 790.99, 1,090.56 and 648.68

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Solution

The fourth proportional to 790.99, 1,090.56 and 648.68 is: 894.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.99 : 1,090.56 = 648.68 : x
  2. Step 2: Convert to fraction form
    790.99/1,090.56 = 648.68/x
  3. Step 3: Cross multiply
    790.99x = 1,090.56 × 648.68
  4. Step 4: Simplify right side
    790.99x = 707,421.22
  5. Step 5: Solve for x
    x = 707,421.22/790.99
  6. Step 6: Final answer
    x = 894.35

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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.