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Finding the Fourth Proportional to 1,201,765, 1,658,435.72 and 665,221

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Solution

The fourth proportional to 1,201,765, 1,658,435.72 and 665,221 is: 918,004.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201,765 : 1,658,435.72 = 665,221 : x
  2. Step 2: Convert to fraction form
    1,201,765/1,658,435.72 = 665,221/x
  3. Step 3: Cross multiply
    1,201,765x = 1,658,435.72 × 665,221
  4. Step 4: Simplify right side
    1,201,765x = 1,103,226,268,094.12
  5. Step 5: Solve for x
    x = 1,103,226,268,094.12/1,201,765
  6. Step 6: Final answer
    x = 918,004.99

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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.