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Finding the Fourth Proportional to 875.36, 1,206.48 and 665.44

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Solution

The fourth proportional to 875.36, 1,206.48 and 665.44 is: 917.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.36 : 1,206.48 = 665.44 : x
  2. Step 2: Convert to fraction form
    875.36/1,206.48 = 665.44/x
  3. Step 3: Cross multiply
    875.36x = 1,206.48 × 665.44
  4. Step 4: Simplify right side
    875.36x = 802,840.05
  5. Step 5: Solve for x
    x = 802,840.05/875.36
  6. Step 6: Final answer
    x = 917.15

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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.