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Finding the Fourth Proportional to 751.68, 1,036.80 and 518.40

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Solution

The fourth proportional to 751.68, 1,036.80 and 518.40 is: 715.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.68 : 1,036.80 = 518.40 : x
  2. Step 2: Convert to fraction form
    751.68/1,036.80 = 518.40/x
  3. Step 3: Cross multiply
    751.68x = 1,036.80 × 518.40
  4. Step 4: Simplify right side
    751.68x = 537,477.12
  5. Step 5: Solve for x
    x = 537,477.12/751.68
  6. Step 6: Final answer
    x = 715.03

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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.