Home / 680,918.52-939,631.56-390,515.10

Finding the Fourth Proportional to 680,918.52, 939,631.56 and 390,515.10

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Solution

The fourth proportional to 680,918.52, 939,631.56 and 390,515.10 is: 538,890.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,918.52 : 939,631.56 = 390,515.10 : x
  2. Step 2: Convert to fraction form
    680,918.52/939,631.56 = 390,515.10/x
  3. Step 3: Cross multiply
    680,918.52x = 939,631.56 × 390,515.10
  4. Step 4: Simplify right side
    680,918.52x = 366,940,312,616.56
  5. Step 5: Solve for x
    x = 366,940,312,616.56/680,918.52
  6. Step 6: Final answer
    x = 538,890.19

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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.