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Finding the Fourth Proportional to 85,967.78, 128,783.93 and 56,295.66

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Solution

The fourth proportional to 85,967.78, 128,783.93 and 56,295.66 is: 84,333.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,967.78 : 128,783.93 = 56,295.66 : x
  2. Step 2: Convert to fraction form
    85,967.78/128,783.93 = 56,295.66/x
  3. Step 3: Cross multiply
    85,967.78x = 128,783.93 × 56,295.66
  4. Step 4: Simplify right side
    85,967.78x = 7,249,976,216.25
  5. Step 5: Solve for x
    x = 7,249,976,216.25/85,967.78
  6. Step 6: Final answer
    x = 84,333.64

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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.