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Finding the Fourth Proportional to 85,783.80, 128,688.12 and 26,624.25

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Solution

The fourth proportional to 85,783.80, 128,688.12 and 26,624.25 is: 39,940.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,783.80 : 128,688.12 = 26,624.25 : x
  2. Step 2: Convert to fraction form
    85,783.80/128,688.12 = 26,624.25/x
  3. Step 3: Cross multiply
    85,783.80x = 128,688.12 × 26,624.25
  4. Step 4: Simplify right side
    85,783.80x = 3,426,224,678.91
  5. Step 5: Solve for x
    x = 3,426,224,678.91/85,783.80
  6. Step 6: Final answer
    x = 39,940.23

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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.