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Finding the Fourth Proportional to 72,705.80, 102,021.40 and 72,705.80

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Solution

The fourth proportional to 72,705.80, 102,021.40 and 72,705.80 is: 102,021.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,705.80 : 102,021.40 = 72,705.80 : x
  2. Step 2: Convert to fraction form
    72,705.80/102,021.40 = 72,705.80/x
  3. Step 3: Cross multiply
    72,705.80x = 102,021.40 × 72,705.80
  4. Step 4: Simplify right side
    72,705.80x = 7,417,547,504.12
  5. Step 5: Solve for x
    x = 7,417,547,504.12/72,705.80
  6. Step 6: Final answer
    x = 102,021.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.