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Finding the Fourth Proportional to 85,417.02, 128,125.99 and 56,021.01

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Solution

The fourth proportional to 85,417.02, 128,125.99 and 56,021.01 is: 84,031.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,417.02 : 128,125.99 = 56,021.01 : x
  2. Step 2: Convert to fraction form
    85,417.02/128,125.99 = 56,021.01/x
  3. Step 3: Cross multiply
    85,417.02x = 128,125.99 × 56,021.01
  4. Step 4: Simplify right side
    85,417.02x = 7,177,746,746.52
  5. Step 5: Solve for x
    x = 7,177,746,746.52/85,417.02
  6. Step 6: Final answer
    x = 84,031.81

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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.