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Finding the Fourth Proportional to 660,031.70, 989,853.15 and 260,539.70

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Solution

The fourth proportional to 660,031.70, 989,853.15 and 260,539.70 is: 390,732.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,031.70 : 989,853.15 = 260,539.70 : x
  2. Step 2: Convert to fraction form
    660,031.70/989,853.15 = 260,539.70/x
  3. Step 3: Cross multiply
    660,031.70x = 989,853.15 × 260,539.70
  4. Step 4: Simplify right side
    660,031.70x = 257,896,042,745.06
  5. Step 5: Solve for x
    x = 257,896,042,745.06/660,031.70
  6. Step 6: Final answer
    x = 390,732.81

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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.