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Finding the Fourth Proportional to 710.36, 1,065.54 and 319.90

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Solution

The fourth proportional to 710.36, 1,065.54 and 319.90 is: 479.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.36 : 1,065.54 = 319.90 : x
  2. Step 2: Convert to fraction form
    710.36/1,065.54 = 319.90/x
  3. Step 3: Cross multiply
    710.36x = 1,065.54 × 319.90
  4. Step 4: Simplify right side
    710.36x = 340,870.51
  5. Step 5: Solve for x
    x = 340,870.51/710.36
  6. Step 6: Final answer
    x = 479.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.