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Finding the Fourth Proportional to 651.97, 899.69 and 390.13

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Solution

The fourth proportional to 651.97, 899.69 and 390.13 is: 538.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.97 : 899.69 = 390.13 : x
  2. Step 2: Convert to fraction form
    651.97/899.69 = 390.13/x
  3. Step 3: Cross multiply
    651.97x = 899.69 × 390.13
  4. Step 4: Simplify right side
    651.97x = 350,993.32
  5. Step 5: Solve for x
    x = 350,993.32/651.97
  6. Step 6: Final answer
    x = 538.36

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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.