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Finding the Fourth Proportional to 1,239,978.47, 1,710,966.53 and 730,611.59

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Solution

The fourth proportional to 1,239,978.47, 1,710,966.53 and 730,611.59 is: 1,008,123.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239,978.47 : 1,710,966.53 = 730,611.59 : x
  2. Step 2: Convert to fraction form
    1,239,978.47/1,710,966.53 = 730,611.59/x
  3. Step 3: Cross multiply
    1,239,978.47x = 1,710,966.53 × 730,611.59
  4. Step 4: Simplify right side
    1,239,978.47x = 1,250,051,973,267.02
  5. Step 5: Solve for x
    x = 1,250,051,973,267.02/1,239,978.47
  6. Step 6: Final answer
    x = 1,008,123.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.