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Finding the Fourth Proportional to 790.48, 1,091.38 and 707.45

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Solution

The fourth proportional to 790.48, 1,091.38 and 707.45 is: 976.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.48 : 1,091.38 = 707.45 : x
  2. Step 2: Convert to fraction form
    790.48/1,091.38 = 707.45/x
  3. Step 3: Cross multiply
    790.48x = 1,091.38 × 707.45
  4. Step 4: Simplify right side
    790.48x = 772,094.94
  5. Step 5: Solve for x
    x = 772,094.94/790.48
  6. Step 6: Final answer
    x = 976.74

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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.