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Finding the Fourth Proportional to 874,686.80, 1,312,613.40 and 401,128.40

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Solution

The fourth proportional to 874,686.80, 1,312,613.40 and 401,128.40 is: 601,960.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    874,686.80 : 1,312,613.40 = 401,128.40 : x
  2. Step 2: Convert to fraction form
    874,686.80/1,312,613.40 = 401,128.40/x
  3. Step 3: Cross multiply
    874,686.80x = 1,312,613.40 × 401,128.40
  4. Step 4: Simplify right side
    874,686.80x = 526,526,512,960.56
  5. Step 5: Solve for x
    x = 526,526,512,960.56/874,686.80
  6. Step 6: Final answer
    x = 601,960.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.