Home / 715,977,905.81-988,042,371.37-398,432,712.66

Finding the Fourth Proportional to 715,977,905.81, 988,042,371.37 and 398,432,712.66

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Solution

The fourth proportional to 715,977,905.81, 988,042,371.37 and 398,432,712.66 is: 549,833,170.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,977,905.81 : 988,042,371.37 = 398,432,712.66 : x
  2. Step 2: Convert to fraction form
    715,977,905.81/988,042,371.37 = 398,432,712.66/x
  3. Step 3: Cross multiply
    715,977,905.81x = 988,042,371.37 × 398,432,712.66
  4. Step 4: Simplify right side
    715,977,905.81x = 393,668,402,248,829,632
  5. Step 5: Solve for x
    x = 393,668,402,248,829,632/715,977,905.81
  6. Step 6: Final answer
    x = 549,833,170.90

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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.