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Finding the Fourth Proportional to 710.88, 979.20 and 555.36

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Solution

The fourth proportional to 710.88, 979.20 and 555.36 is: 764.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.88 : 979.20 = 555.36 : x
  2. Step 2: Convert to fraction form
    710.88/979.20 = 555.36/x
  3. Step 3: Cross multiply
    710.88x = 979.20 × 555.36
  4. Step 4: Simplify right side
    710.88x = 543,808.51
  5. Step 5: Solve for x
    x = 543,808.51/710.88
  6. Step 6: Final answer
    x = 764.98

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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.