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Finding the Fourth Proportional to 691,987.76, 955,038.48 and 405,622.16

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Solution

The fourth proportional to 691,987.76, 955,038.48 and 405,622.16 is: 559,814.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,987.76 : 955,038.48 = 405,622.16 : x
  2. Step 2: Convert to fraction form
    691,987.76/955,038.48 = 405,622.16/x
  3. Step 3: Cross multiply
    691,987.76x = 955,038.48 × 405,622.16
  4. Step 4: Simplify right side
    691,987.76x = 387,384,771,140.72
  5. Step 5: Solve for x
    x = 387,384,771,140.72/691,987.76
  6. Step 6: Final answer
    x = 559,814.48

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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.