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Finding the Fourth Proportional to 711.36, 980.64 and 555.84

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Solution

The fourth proportional to 711.36, 980.64 and 555.84 is: 766.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.36 : 980.64 = 555.84 : x
  2. Step 2: Convert to fraction form
    711.36/980.64 = 555.84/x
  3. Step 3: Cross multiply
    711.36x = 980.64 × 555.84
  4. Step 4: Simplify right side
    711.36x = 545,078.94
  5. Step 5: Solve for x
    x = 545,078.94/711.36
  6. Step 6: Final answer
    x = 766.25

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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.