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Finding the Fourth Proportional to 879,213.68, 1,213,315.56 and 476,805.68

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Solution

The fourth proportional to 879,213.68, 1,213,315.56 and 476,805.68 is: 657,992.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    879,213.68 : 1,213,315.56 = 476,805.68 : x
  2. Step 2: Convert to fraction form
    879,213.68/1,213,315.56 = 476,805.68/x
  3. Step 3: Cross multiply
    879,213.68x = 1,213,315.56 × 476,805.68
  4. Step 4: Simplify right side
    879,213.68x = 578,515,750,640.38
  5. Step 5: Solve for x
    x = 578,515,750,640.38/879,213.68
  6. Step 6: Final answer
    x = 657,992.21

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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.