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Finding the Fourth Proportional to 645,987.38, 891,453.87 and 359,507.39

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Solution

The fourth proportional to 645,987.38, 891,453.87 and 359,507.39 is: 496,115.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,987.38 : 891,453.87 = 359,507.39 : x
  2. Step 2: Convert to fraction form
    645,987.38/891,453.87 = 359,507.39/x
  3. Step 3: Cross multiply
    645,987.38x = 891,453.87 × 359,507.39
  4. Step 4: Simplify right side
    645,987.38x = 320,484,249,651.83
  5. Step 5: Solve for x
    x = 320,484,249,651.83/645,987.38
  6. Step 6: Final answer
    x = 496,115.35

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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.