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Finding the Fourth Proportional to 85,578.64, 128,368.50 and 56,021.28

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Solution

The fourth proportional to 85,578.64, 128,368.50 and 56,021.28 is: 84,032.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,578.64 : 128,368.50 = 56,021.28 : x
  2. Step 2: Convert to fraction form
    85,578.64/128,368.50 = 56,021.28/x
  3. Step 3: Cross multiply
    85,578.64x = 128,368.50 × 56,021.28
  4. Step 4: Simplify right side
    85,578.64x = 7,191,367,681.68
  5. Step 5: Solve for x
    x = 7,191,367,681.68/85,578.64
  6. Step 6: Final answer
    x = 84,032.27

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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.