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Finding the Fourth Proportional to 86,775.30, 129,968.55 and 51,783.30

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Solution

The fourth proportional to 86,775.30, 129,968.55 and 51,783.30 is: 77,558.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,775.30 : 129,968.55 = 51,783.30 : x
  2. Step 2: Convert to fraction form
    86,775.30/129,968.55 = 51,783.30/x
  3. Step 3: Cross multiply
    86,775.30x = 129,968.55 × 51,783.30
  4. Step 4: Simplify right side
    86,775.30x = 6,730,200,415.22
  5. Step 5: Solve for x
    x = 6,730,200,415.22/86,775.30
  6. Step 6: Final answer
    x = 77,558.94

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1.5x scale

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.