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Finding the Fourth Proportional to 128,533.60, 192,728.88 and 39,762.40

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Solution

The fourth proportional to 128,533.60, 192,728.88 and 39,762.40 is: 59,621.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,533.60 : 192,728.88 = 39,762.40 : x
  2. Step 2: Convert to fraction form
    128,533.60/192,728.88 = 39,762.40/x
  3. Step 3: Cross multiply
    128,533.60x = 192,728.88 × 39,762.40
  4. Step 4: Simplify right side
    128,533.60x = 7,663,362,818.11
  5. Step 5: Solve for x
    x = 7,663,362,818.11/128,533.60
  6. Step 6: Final answer
    x = 59,621.47

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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.