Home / 680,921.52-939,635.70-390,518.10

Finding the Fourth Proportional to 680,921.52, 939,635.70 and 390,518.10

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Solution

The fourth proportional to 680,921.52, 939,635.70 and 390,518.10 is: 538,894.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,921.52 : 939,635.70 = 390,518.10 : x
  2. Step 2: Convert to fraction form
    680,921.52/939,635.70 = 390,518.10/x
  3. Step 3: Cross multiply
    680,921.52x = 939,635.70 × 390,518.10
  4. Step 4: Simplify right side
    680,921.52x = 366,944,748,256.17
  5. Step 5: Solve for x
    x = 366,944,748,256.17/680,921.52
  6. Step 6: Final answer
    x = 538,894.33

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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.