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Finding the Fourth Proportional to 687,452.55, 948,798.63 and 400,972.65

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Solution

The fourth proportional to 687,452.55, 948,798.63 and 400,972.65 is: 553,408.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,452.55 : 948,798.63 = 400,972.65 : x
  2. Step 2: Convert to fraction form
    687,452.55/948,798.63 = 400,972.65/x
  3. Step 3: Cross multiply
    687,452.55x = 948,798.63 × 400,972.65
  4. Step 4: Simplify right side
    687,452.55x = 380,442,300,987.47
  5. Step 5: Solve for x
    x = 380,442,300,987.47/687,452.55
  6. Step 6: Final answer
    x = 553,408.81

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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.