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Finding the Fourth Proportional to 703.36, 1,055.12 and 486.40

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Solution

The fourth proportional to 703.36, 1,055.12 and 486.40 is: 729.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    703.36 : 1,055.12 = 486.40 : x
  2. Step 2: Convert to fraction form
    703.36/1,055.12 = 486.40/x
  3. Step 3: Cross multiply
    703.36x = 1,055.12 × 486.40
  4. Step 4: Simplify right side
    703.36x = 513,210.37
  5. Step 5: Solve for x
    x = 513,210.37/703.36
  6. Step 6: Final answer
    x = 729.66

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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.