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Finding the Fourth Proportional to 85,655.90, 128,483.85 and 57,662.30

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Solution

The fourth proportional to 85,655.90, 128,483.85 and 57,662.30 is: 86,493.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,655.90 : 128,483.85 = 57,662.30 : x
  2. Step 2: Convert to fraction form
    85,655.90/128,483.85 = 57,662.30/x
  3. Step 3: Cross multiply
    85,655.90x = 128,483.85 × 57,662.30
  4. Step 4: Simplify right side
    85,655.90x = 7,408,674,303.86
  5. Step 5: Solve for x
    x = 7,408,674,303.86/85,655.90
  6. Step 6: Final answer
    x = 86,493.45

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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.