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Finding the Fourth Proportional to 672,416,410.68, 927,894,683.88 and 390,136,985.88

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Solution

The fourth proportional to 672,416,410.68, 927,894,683.88 and 390,136,985.88 is: 538,365,854.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    672,416,410.68 : 927,894,683.88 = 390,136,985.88 : x
  2. Step 2: Convert to fraction form
    672,416,410.68/927,894,683.88 = 390,136,985.88/x
  3. Step 3: Cross multiply
    672,416,410.68x = 927,894,683.88 × 390,136,985.88
  4. Step 4: Simplify right side
    672,416,410.68x = 362,006,035,183,018,624
  5. Step 5: Solve for x
    x = 362,006,035,183,018,624/672,416,410.68
  6. Step 6: Final answer
    x = 538,365,854.01

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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.