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Finding the Fourth Proportional to 839,809,985.60, 1,259,714,978.40 and 666,347,643.20

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Solution

The fourth proportional to 839,809,985.60, 1,259,714,978.40 and 666,347,643.20 is: 999,521,464.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    839,809,985.60 : 1,259,714,978.40 = 666,347,643.20 : x
  2. Step 2: Convert to fraction form
    839,809,985.60/1,259,714,978.40 = 666,347,643.20/x
  3. Step 3: Cross multiply
    839,809,985.60x = 1,259,714,978.40 × 666,347,643.20
  4. Step 4: Simplify right side
    839,809,985.60x = 839,408,106,960,579,072
  5. Step 5: Solve for x
    x = 839,408,106,960,579,072/839,809,985.60
  6. Step 6: Final answer
    x = 999,521,464.80

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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.