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Finding the Fourth Proportional to 716,290.65, 988,460.25 and 394,000.65

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Solution

The fourth proportional to 716,290.65, 988,460.25 and 394,000.65 is: 543,709.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,290.65 : 988,460.25 = 394,000.65 : x
  2. Step 2: Convert to fraction form
    716,290.65/988,460.25 = 394,000.65/x
  3. Step 3: Cross multiply
    716,290.65x = 988,460.25 × 394,000.65
  4. Step 4: Simplify right side
    716,290.65x = 389,453,980,999.16
  5. Step 5: Solve for x
    x = 389,453,980,999.16/716,290.65
  6. Step 6: Final answer
    x = 543,709.43

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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.