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Finding the Fourth Proportional to 661,515.90, 912,815.91 and 374,978.94

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Solution

The fourth proportional to 661,515.90, 912,815.91 and 374,978.94 is: 517,427.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,515.90 : 912,815.91 = 374,978.94 : x
  2. Step 2: Convert to fraction form
    661,515.90/912,815.91 = 374,978.94/x
  3. Step 3: Cross multiply
    661,515.90x = 912,815.91 × 374,978.94
  4. Step 4: Simplify right side
    661,515.90x = 342,286,742,346.94
  5. Step 5: Solve for x
    x = 342,286,742,346.94/661,515.90
  6. Step 6: Final answer
    x = 517,427.84

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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.