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Finding the Fourth Proportional to 85,980.40, 128,970.60 and 64,985.20

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Solution

The fourth proportional to 85,980.40, 128,970.60 and 64,985.20 is: 97,477.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,980.40 : 128,970.60 = 64,985.20 : x
  2. Step 2: Convert to fraction form
    85,980.40/128,970.60 = 64,985.20/x
  3. Step 3: Cross multiply
    85,980.40x = 128,970.60 × 64,985.20
  4. Step 4: Simplify right side
    85,980.40x = 8,381,180,235.12
  5. Step 5: Solve for x
    x = 8,381,180,235.12/85,980.40
  6. Step 6: Final answer
    x = 97,477.80

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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.