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Finding the Fourth Proportional to 64,985.60, 97,420.80 and 42,809.60

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Solution

The fourth proportional to 64,985.60, 97,420.80 and 42,809.60 is: 64,176.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,985.60 : 97,420.80 = 42,809.60 : x
  2. Step 2: Convert to fraction form
    64,985.60/97,420.80 = 42,809.60/x
  3. Step 3: Cross multiply
    64,985.60x = 97,420.80 × 42,809.60
  4. Step 4: Simplify right side
    64,985.60x = 4,170,545,479.68
  5. Step 5: Solve for x
    x = 4,170,545,479.68/64,985.60
  6. Step 6: Final answer
    x = 64,176.46

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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.