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Finding the Fourth Proportional to 870,987.12, 1,201,931.40 and 489,030

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Solution

The fourth proportional to 870,987.12, 1,201,931.40 and 489,030 is: 674,844.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    870,987.12 : 1,201,931.40 = 489,030 : x
  2. Step 2: Convert to fraction form
    870,987.12/1,201,931.40 = 489,030/x
  3. Step 3: Cross multiply
    870,987.12x = 1,201,931.40 × 489,030
  4. Step 4: Simplify right side
    870,987.12x = 587,780,512,542
  5. Step 5: Solve for x
    x = 587,780,512,542/870,987.12
  6. Step 6: Final answer
    x = 674,844.09

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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.