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Finding the Fourth Proportional to 42,802.60, 64,208.70 and 13,220.20

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Solution

The fourth proportional to 42,802.60, 64,208.70 and 13,220.20 is: 19,831.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,802.60 : 64,208.70 = 13,220.20 : x
  2. Step 2: Convert to fraction form
    42,802.60/64,208.70 = 13,220.20/x
  3. Step 3: Cross multiply
    42,802.60x = 64,208.70 × 13,220.20
  4. Step 4: Simplify right side
    42,802.60x = 848,851,855.74
  5. Step 5: Solve for x
    x = 848,851,855.74/42,802.60
  6. Step 6: Final answer
    x = 19,831.78

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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.