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Finding the Fourth Proportional to 145,376.40, 217,918.80 and 66,547.20

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Solution

The fourth proportional to 145,376.40, 217,918.80 and 66,547.20 is: 99,754.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,376.40 : 217,918.80 = 66,547.20 : x
  2. Step 2: Convert to fraction form
    145,376.40/217,918.80 = 66,547.20/x
  3. Step 3: Cross multiply
    145,376.40x = 217,918.80 × 66,547.20
  4. Step 4: Simplify right side
    145,376.40x = 14,501,885,967.36
  5. Step 5: Solve for x
    x = 14,501,885,967.36/145,376.40
  6. Step 6: Final answer
    x = 99,754.06

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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.