Home / 390,739,873.56-585,985,372.75-128,363,521.47

Finding the Fourth Proportional to 390,739,873.56, 585,985,372.75 and 128,363,521.47

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Solution

The fourth proportional to 390,739,873.56, 585,985,372.75 and 128,363,521.47 is: 192,504,402.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,739,873.56 : 585,985,372.75 = 128,363,521.47 : x
  2. Step 2: Convert to fraction form
    390,739,873.56/585,985,372.75 = 128,363,521.47/x
  3. Step 3: Cross multiply
    390,739,873.56x = 585,985,372.75 × 128,363,521.47
  4. Step 4: Simplify right side
    390,739,873.56x = 75,219,145,974,064,880
  5. Step 5: Solve for x
    x = 75,219,145,974,064,880/390,739,873.56
  6. Step 6: Final answer
    x = 192,504,402.71

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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.