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Finding the Fourth Proportional to 61,578.40, 84,973.50 and 40,320.76

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Solution

The fourth proportional to 61,578.40, 84,973.50 and 40,320.76 is: 55,639.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,578.40 : 84,973.50 = 40,320.76 : x
  2. Step 2: Convert to fraction form
    61,578.40/84,973.50 = 40,320.76/x
  3. Step 3: Cross multiply
    61,578.40x = 84,973.50 × 40,320.76
  4. Step 4: Simplify right side
    61,578.40x = 3,426,196,099.86
  5. Step 5: Solve for x
    x = 3,426,196,099.86/61,578.40
  6. Step 6: Final answer
    x = 55,639.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.